MIPS: KVM: Refactor added offsetof()s

When calculating the offsets into the commpage for dynamically
translated mtc0/mfc0 guest instructions, multiple offsetof()s are added
together to find the offset of the specific register in the mips_coproc,
within the commpage.

Simplify each of these cases to a single offsetof() to find the offset
of the specific register within the commpage.

Signed-off-by: James Hogan <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Cc: Gleb Natapov <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/11888/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/kvm/dyntrans.c

···
 	} else {
 		mfc0_inst = LW_TEMPLATE;
 		mfc0_inst |= ((rt & 0x1f) << 16);
-		mfc0_inst |=
-		    offsetof(struct mips_coproc,
-			     reg[rd][sel]) + offsetof(struct kvm_mips_commpage,
-						      cop0);
+		mfc0_inst |= offsetof(struct kvm_mips_commpage,
+				      cop0.reg[rd][sel]);
 	}
 
 	if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
···
 	sel = inst & 0x7;
 
 	mtc0_inst |= ((rt & 0x1f) << 16);
-	mtc0_inst |=
-	    offsetof(struct mips_coproc,
-		     reg[rd][sel]) + offsetof(struct kvm_mips_commpage, cop0);
+	mtc0_inst |= offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]);
 
 	if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
 		kseg0_opc =